#include <sys/types.h>
#include <string.h>
#include <dirent.h>

int
main(int argc, char *argv[]){
  DIR *dp;
  struct dirent *dirp;

  if(argc != 2){
    puts("usage: ls directory_name");
    exit(1);
  }

  if((dp = opendir(argv[1])) == NULL){
    printf("can't open %s : ", argv[1]);
    printf("%s\n", strerror(errno));
    exit(1);
  }

  while((dirp = readdir(dp)) != NULL)
    printf("%s\n", dirp->d_name);

  closedir(dp);
  exit(0);
}
